Library function exist ?

Hi all,

I've checked in the exec autodoc, and over the net without finding a solution.

I'd like to know if,
when we open a .library using IExec->OpenLibrary( char *libname, int ver );
if there is a function to know if a specific function exist in the lirary. Something like :

GetFunctionExist( char* lifunctionname, void *libtruct );

Possible ?

Regards,
Freddix / AmiDARK

@freddix

No, purely because functions are stored as vectors, it has no concept of a function "name".

The name of a function is purely there to specify the vector offset to the compiler from within human readable source code. You can check manually by interogating the interafce file for the library concerned.

Programatically, you may need to check the version and revision numbers after opening the library to see if the required function is available, but you need to know beforehand.

Simon

@freddix
It's what I believed ... but I hoped for a solution ...
so ..
no function like "DLL Open" from DarkBASIC Pro in AmiDARK Engine.

@freddix

Not with standard Amiga shared libraries. But you can generate a library in form of an ELF file (binary) in which you preserve the symbols of the functions you want to use later, and use elf.library to retrieve pointers on them.

@centaurz
Yes, but for what I need, this method is not adapted.

The objective was to add commands like in DarkBASIC Professional / DarkGDK :

OpenDLL( char *DllName, int DLLChannel )
CloseDLL( int DLLChannel )
FunctionExistDLL( int DLLChannel, char *DLLFunctionName )
FunctionCallDLL( int DLLChannel, char *DLLFunctionName, DWORD Arg1, ... )

User must have to use only these ones .. if he had to recompile a library or something else .. the command set will become too complex for a language similar to BASIC(s) ;)

so, I'll remove the Library version (of DLL command set) in AmiDARK Engine project.

Regards,
Freddix / AmiDARK

@freddix

Actually anyone who has a fully installed software developer kit should have an SFD file for each library. If an SFD file is anything like its predecessor the FD file it should be possible to probe the SFD file to find out what function names are in a library, what parameters correspond to which registers in the processor and stuff like that. It would only work under AmigaOS 4.x however and it would require a system assign to the directory containing the SFD files and furthermore probing them is deprecated except for using an external executable.

Maybe it's better if you do leave this function out for a while until the ABI settles to a permanent standard.

@Samurai_Crow
Yes I know this but it don't solve the case of lib not included in the SDK ...

@freddix

you can use shared objects. load them with dlopen()/dlclose and use dlsym() to load/test the function existence:

http://www.opengroup.org/onlinepubs/009695399/functions/dlsym.html

@afxgroup:
Nice idea :)
I'll check this carefully :)
if I can replace the DLL functions with so support ones, it can be a good (similarity) replacement.

Regards,
Freddix / AmiDARK.